Galactus doesn't have a true form, and is an energy being seen in different ways by different people, ... This even extends to animals, with The Unbeatable Squirrel Girl #4 ...

Galactus, Devourer of Worlds, is an amorphous abstract entity with no true form.While readers see the Great Devourer as a monstrously large bald man in a purple suit, Galactus can project any form ...

The post, which you can check out below, also included a second image showing Galactus in full, armor-clad form, ... Fantastic Four: First Steps Poster Shows Galactus' True Size, ...

A Galactus that is tall enough to peek into a skyscraper is not tall enough, in my honest opinion. To be a true Devourer of Worlds, he has to be an unfathomable size that's hard to quantify.